IFI16/AIM2 inflammasomes control Gal-9 and PVR in myeloid cells from PWH and their targeting improves immunotherapy against HIV-1

Abstract

Chronic inflammation in people with HIV-1 (PWH) is associated with low CD4/CD8 T-cell ratios and inflammasome activation, which may impair monocyte (Mo) and monocyte-derived dendritic cell (MDDC) function and limit the efficacy of myeloid-based immunotherapies. Here, we investigated the role of inflammasome sensors in regulating immune ligands for TIM3 and TIGIT immune checkpoints in Mo and MDDC from PWH and their capacity to activate HIV-1-specific CD8+ T cells. Following TLR stimulation, galectin-9 (Gal-9), PVR and IL-1{beta} were preferentially upregulated in cells from PWH with low CD4/CD8 ratios. IFI16 and AIM2 expression was increased basally or inducible in Mo and co-localized with caspase-1 in these myeloid cells present in lymphoid tissues of HIV-1-infected humanized mice. Si-RNA or small molecule-mediated inhibition of IFI16/AIM2 reduced Gal-9 and PVR expression in MDDC and enhanced their ability to activate polyfunctional HIV-1-specific CD8+ T-cells displaying improved elimination of infected CD4+ T cells in vitro and in vivo. These findings identify IFI16 and AIM2 as key regulators of myeloid dysfunction and therapeutic targets to enhance HIV-1 immunotherapies.